Stanley Essential Screwdrivers have bars made from Chrome Vanadium Steel, which resists bending and snapping. The handles are made from Polypropylene, with TPR overlay for increased comfort and reduced fatigue. Increased torque can be applied by using another bar through the hole at the top of each handle. This set of 20 contains the following: 4 x Phillips: PH0 x 50mm, PH1 x 75mm and PH2 x 100mm (x2).3 x Pozidriv: PZ1 x 100mm and PZ2 x 100mm (x2).5 x Flared Slotted: 5.5 x 100mm (x2), 6.5 x 150mm (x2) and 8 x 175mm.5 x Parallel Slotted: 2.5 x 50mm, 3 x 75mm, 3.5 x 75mm and 4 x 100mm (x2).3 x TORX: TX10 x 10mm, TX15 x 100mm and TX20 x 100mm.Additional Information:Set Type: SL/PH/PZ/TXNo. Pieces: 20